Thank you for reaching out to ask2.extension.

I found this from the Department of Entomology from the University of Kentucky.  

Chiggers are most commonly encountered in overgrown areas but can live in yards and near parks and camps where they will spoil a nice weekend outside.  Skin based repellents for ticks and mosquitoes can also repel chiggers. DEET is the best option for your skin, permethrin is an insecticide you can apply to clothing.   Over the counter medications, like hydrocortisone, may help, though the itchy symptoms will likely persist for about 10-14 days.

Long-term solutions to chiggers include brush removal, mowing, and landscape management to cut down on suitable habitats. Increasing light penetration and reducing humidity in given areas (by opening them up through plant removal) can reduce chigger attraction to an area. It also reduces habitat for other potential chigger hosts, meaning there could be fewer chiggers in that area.

Insecticides won’t provide long-term control over chiggers but can help to reduce populations quickly so you can get back outside and work or enjoy your landscape. Hot spot treatments with products containing bifenthrin, permethrin, cyhalothrin, or carbaryl would provide 1-2 weeks of control (depending on the product used and the weather). Follow label directions but treat the afflicted vegetation up to a height of about three feet. Treating in April or May would provide effective timing, in serious infestations there may need to be a follow up application in June.

I hope this helps.  Chiggers are no fun.